How much would these Mitsubishi eclipse performance parts cost?

The parts list UNINSTALLED will be in the $7000 range. Add another $2,000 for install and necessary tuning/unknowns. After all is said and done you can still only push 14psi on this motor due to no internal work on the block itself. You would be in the 300-320 whp range. Now add another $3,000-$5,000 for a complete rebuild and a larger turbo like a GT35R or GT40R and you can make the 500 whp mark.